A plug system includes a locked member of a first plug and a free member of a second plug. The locked member has a first locking end having a first anti-rotation feature. The free member has a second locking end having a second anti-rotation feature. The first anti-rotation feature and the second anti-rotation feature are configured to fit together to resist a rotation between the free member and the locked member to thereby resist rotation of the second plug with respect to the first plug.